<template>
  <div class="count">
    <h2>当前求和为：{{$store.state.sum}}</h2>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再+</button>
    <button @click="incrementWait">等一等+</button>
  </div>
</template>

<script>
  export default {
    name:'Count',
    data() {
      return {
        n:1
      }
    },
    methods: {
      increment(){
        this.$store.state.sum += this.n
      },
      decrement(){
        //  this.sum -= this.n
      },
      incrementOdd(){
        // if(this.sum % 2){
          //  this.sum += this.n
        // }
      },
      incrementWait(){
        setTimeout(() => {
          // this.sum += this.n
        }, 1000);
      }
    }
  }
</script>

<style scoped>
  .count {
    background-color: skyblue;
    padding: 20px;
  }
  button {
    margin-left: 10px;
  }
</style>